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Fix 8359 crash on open dock multiwindow mode, Windows

Lloyd Konneker requested to merge bootchk/gimp:dockCloseCrash into master

This MR supercedes !684 (closed) which garbles two issues and doesn't fix this issue.

This MR will fix 8359 when backported to 2.10. See commit text for other related issues it will close.

I will leave merging to others, since it is not my usual area. I will leave backporting to others, or I might be able to do it after review.

Lightly tested on Windows and Linux.

It touches GimpPopup, which is also used for example in Filters>Map>BumpMap>AuxInput, also lightly tested.

A test case should be added, but we already have aggravation with multiwindow tests.

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